Journal
ANNALS OF FINANCE
Volume 6, Issue 4, Pages 435-454Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10436-010-0164-4
Keywords
Robust control; Portfolio choice; Recursive preferences; Mean-reverting
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This paper examines a continuous-time intertemporal consumption and portfolio choice problem for an investor with recursive preferences. The investor worries about model misspecification and seeks robust decision rules. The expected excess return of a risky asset follows a mean-reverting process. I find that whether the concern about model misspecification decreases the total demand for equities largely depends on risk aversion and the attitude toward intertemporal substitution. When the elasticity of intertemporal substitution is about 1 and risk aversion is moderate, the aversion to model uncertainty increases the proportion of wealth invested in equities. The calibration analysis based on detection-error probabilities shows that the quantitative effect of robustness is almost negligible.
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